Power Quality

Advancements in electronics have introduced greater command over the engineering and manufacturing processes. Widespread adoption of the process automation is a testimony of this development. This automation demands deployment of lots of electronic devices such as computers, servers, PLCs, electronic cards, etc. And these electronic components do humongous amount of switching for AC to DC and DC to AC conversions, offering smoother control. Unfortunately such actions invite Harmonics in the power system of the plant. And the electronic cards and protection devices are susceptible to these Harmonics. Envolta offers solutions covering an extensively wide range of Harmonic related issues in the Power System.

Poor power quality has made the manufacturing units vulnerable to a wide range of issues, such as nuisance tripping of the production line equipment, malfunctioning of the protection relays, reduced machine lives, abnormal noise in panels, degradation of machine efficiency.

Addressing such a wide range of problems, Envolta helped the organizations in reducing their maintenance cost, improving their machine performances, and in turn contributing to their profitability. Here is a sneak-peak to our state-of-the art engineering solution

Power Quality: Typical issues & Solution by Envolta

  • Low PF in holidays or when the load is very low
  • 24-hour load profile recorded, and installed new APFC relay with 3 mA sensitivity and added required min kVAr capacitor step
  • Getting abnormal noise in bus-duct between Transformer and PCC, Not able to load furnace due to this noise and very high vibration
  • Observed -ve sequence current caused by high freq (250 Hz) current in the system. Installed a particular LC filter to filter it out.
  • Frequent failures in VFD / PLC / Machine cards
  • Load analysis showed that harmonics got amplified due to 440V capacitors. Also observed poor earthing at certain locations. Installed LC filters. Failures reduced drastically.
  • Frequent failures in VFD / PLC / Machine cards
  • A clear case of malfunctioning ACB, when harmonics level is at peak. Installed LC filters & Passive filters.
  • Frequent failure of cap duty contactors in APFC Panel
  • Due to dynamic load behaviour, the number of switching operations of contactors is very high. Replaced contactors with Thyristors and now switching is smooth.
  • In an existing RTPFC Panel, experienced frequent Thyristor failures
  • An improper heat dissipation system was observed. We advised them and then replace TSM with Cap duty contactors.
  • Why do we experience noise in our detuned reactors in APFC Panel?
  • It could be due to improper tuning of LC circuit. We study & propose a solution.
  • The harmonics pattern is very dynamic. It is contributing a mix of various level of harmonics. What is the solution to it?
  • This happens where there is a mix of various types of non-linear loads. In such a case, proposed and installed Active Harmonics Filter. It resulted in less than 5% THDi level.
  • Do you have any solution for robotic application? Our few controllers are getting failed due to poor power quality.
  • During the study, we observed 0-100% load variations in less than 2-3 seconds. The failure of the electronic controller is due to a higher harmonics level only. We proposed AHF here, no other solution will work in such cases.

Retrofitting, design & deployment

We can do retrofitting in the existing capacitor panel with LC filters
(with contactors or
with TSM)

We design power factor improvement panels for projects based on load details.

We proposed centralised RTPFC / decentralised RTPFC Panels / Fixed capacitors in the project, based on load
calculations.

Poor Power Factor not only increases your electricity bill, but also introduces poor power quality.
We design and deploy asolution with a guarantee for PF above 0.99

Our Solutions are backed by superior engineering

Authorised channel partner of

  • Envolta Systems Private Limited​
  • TF/25, Omkar-2,
  • Nr. GIDC Bus Depot,​
  • Ankleshwar, Gujarat-393001
Ankleswar office location
  • Envolta Systems Private
  • GF-7/8/9, Samanvay Sequence,
  • Manjalpur,
  • Vadodara, Gujarat - 390011
Vadodara office location